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Air Filter pods vs. box?

Discussion in 'XJ Technical Chat' started by DMoreyXJ550, Jun 26, 2007.

  1. DMoreyXJ550

    DMoreyXJ550 Member

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    I have no intentions of switching to pods on my maxi but i was woundering.
    What is more eficient as far as performance? And is pods ruff on the motor? I do know that if you run pods you have to upgrade a few things; the upgrade is in you're carb i think.....
     
  2. RickCoMatic

    RickCoMatic Well-Known Member

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    The quantity of AIR, measured in Cubic Feet per Minute (CFM) is regulated by the AIRBOX Rubber Intake Port.

    ALL the AIR supplied to (and shared by) the four Carbs enters the AIRBOX through the RUBBER INTAKE PORT beneath the seat.

    The Carbs are ENGINEERED to operate with that Volume of CFM divided by 4.
    All the JETTING is therefore set to supply FUEL to that restricted volume of AIR; the ONLY source for AIR to the Carbs open to the atmosphere.

    The installation of PODS removes the restriction and instead of the known value of Maximum CFM drawn through the RUBBER INLET; the restriction is REMOVED.
    The CFM Value is NOT divided.
    Each Carb is individually opened to atmosphere.

    The resultant factor is that of NOT dividing the known value of air entering the engine ... but, rather multiplying the AIR SUPPLY by a factor of 4.

    Entirely too much air is present.
    The Fuel Supply can't adjust to the new volume and the engine runs (or maybe does not) LEAN.

    To correct the Air-Fuel Ratio it is necessary to REJET. Replace the FUEL JETS and adjust FUEL METERING FEATURES to respond to the increased volume of AIR.

    Enough testing had been done to determine how much more FUEL is needed.
    Kits are available to rectify the sudden change in the volume of air with suitable replacement FUEL Jets.

    Complicating the replacement is the need to remove the carbs each time a Fuel Jetting change is made.
     
  3. XJoregonian

    XJoregonian Member

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    Keep the stock setup!! 8O Just my Humble Opinion!!! :lol:
     
  4. Robert

    Robert Active Member

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    I'll second that vote, pods are just another thing you have to clean more often for very modest power gain (and, depending upon RPM range, power loss too).
     

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